$\frac{2x-1}{x-3}\le1$
$-4\:+\:3\:\:x\:\:4\:$
$\left(2k+3e\right)\left(2k-3e\right)$
$x^2-5x+x$
$3x^2+25x-30\le0$
$\int4x^5\left(6x^6+3\right)^5dx$
$6x\:4\:-\:30x\:3\:+\:2x\:2$
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